EP3424695A1 - Verfahren zur herstellung eines polyurethanschaums mit thermoplastischen folien - Google Patents

Verfahren zur herstellung eines polyurethanschaums mit thermoplastischen folien Download PDF

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Publication number
EP3424695A1
EP3424695A1 EP17179937.2A EP17179937A EP3424695A1 EP 3424695 A1 EP3424695 A1 EP 3424695A1 EP 17179937 A EP17179937 A EP 17179937A EP 3424695 A1 EP3424695 A1 EP 3424695A1
Authority
EP
European Patent Office
Prior art keywords
mold
thermoplastic film
mold base
base
mold plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17179937.2A
Other languages
English (en)
French (fr)
Inventor
Chi-Yuan Hung
Yih-Chen Lin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Feng Tay Enterprise Co Ltd
FENG TAY ENTERPRISES Co Ltd
Original Assignee
Feng Tay Enterprise Co Ltd
FENG TAY ENTERPRISES Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Feng Tay Enterprise Co Ltd, FENG TAY ENTERPRISES Co Ltd filed Critical Feng Tay Enterprise Co Ltd
Priority to EP17179937.2A priority Critical patent/EP3424695A1/de
Publication of EP3424695A1 publication Critical patent/EP3424695A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
    • B29D35/128—Moulds or apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
    • B29D35/122—Soles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
    • B29D35/14—Multilayered parts
    • B29D35/142—Soles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
    • B29D35/14—Multilayered parts
    • B29D35/148—Moulds or apparatus therefor

Definitions

  • the present invention is related to a footwear manufacturing technology, and more particularly to a method for forming a polyurethane foam covered with thermoplastic films.
  • one known method is to lacquer the surface of the polyurethane foam after the foam-forming step so as to increase its resistance to hydrolysis, yellowing, and abrasion.
  • the lacquer process is harmful to the worker health and is also damage to the environment.
  • Taiwanese Patent no. TW 563624 titled "Structure with wear-resistant stereoscopic foamed objects”
  • a method for covering a foam with a plastic film to increase its water-resistance and abrasion-resistance is disclosed.
  • Similar technologies are also disclosed in Taiwanese Patent no. TW 583919 , titled “TPU protective device”, and in Taiwanese Patent no. TW397168 , titled “Insoles and outsoles with thermoplastic side wall covering layer”.
  • Taiwanese Patent no. TW397168 titled “Insoles and outsoles with thermoplastic side wall covering layer”.
  • only part of the foam can be covered with the plastic film, and a comprehensive covering cannot be achieved due to the mold structure or the technology thereof. Whereby, the properties of resistance to hydrolysis, yellowing, and abrasion are decreased.
  • conventional methods include a step of spraying a releasing agent inside the mold to prevent the shaped material adhering thereto.
  • some residues of the releasing agent may be left on the inner surface of the mold and affects the following process.
  • the spraying of the releasing agent and the following cleaning process thereof both multiply the manufacturing process.
  • the purpose of the present invention is to provide a method for forming a polyurethane foam covered with thermoplastic films.
  • the method can cover the thermoplastic films around the polyurethane foam, and can increase product throughput by reducing the process time thereof.
  • the present invention provides a method for forming a polyurethane foam covered with thermoplastic films.
  • the method utilizes a mold including a first mold base, a second mold base, and a middle frame.
  • the first mold base includes a mold cavity.
  • the second mold base includes a mold core.
  • the middle frame is positioned between the first mold base and the second mold base, and includes a hollow part. The mold core passes through the hollow part.
  • the method includes steps of positioning a first thermoplastic film between the first mold base and the middle frame; positioning a second thermoplastic film between the second mold base and the middle frame, wherein the first thermoplastic film attaches to an inner wall of the mold cavity, and the second thermoplastic film attaches to a surface of the mold core; positioning a polyurethane mixture on the first thermoplastic film which the polyurethane mixture is positioned in the mold cavity; closing and heating the mold to react the polyurethane mixture to form a shaped polyurethane foam combined with the first thermoplastic film and the second thermoplastic film; and opening the mold to take out the shaped polyurethane foam covered with thermoplastic films.
  • the advantage of the present invention is to provide a polyurethane foam with good properties of hydrolysis resistance, yellowing resistance, and abrasion resistance by covering two thermoplastic films around the polyurethane foam.
  • FIG. 1 to FIG. 4 a mold 100 used in a method of an embodiment according to the present invention is shown in the figures.
  • the mold 100 is adapted to cover two thermoplastic films around a polyurethane foam.
  • the mold 100 includes a first mold base 10, a second mold base 20 and a middle frame 30.
  • the first mold base 10 includes a mold cavity 12 adapted for shaping;
  • the second mold base 20 includes a protrusion defining a mold core 22 corresponding to the mold cavity 12;
  • the middle frame 30 is positioned between the first mold base 10 and the second mold base 20, and includes a hollow part corresponding to the mold cavity 12; and the mold core 22 can pass through the hollow part.
  • the first mold base 10 includes a groove 14 around the mold cavity 12 on its top surface, and a plurality of first nails 16 are positioned around the groove 14.
  • the first mold base 10 includes a plurality of first vents 18. Each of the first vents 18 includes one end communicating with the mold cavity 12, and another end communicating to the outside of the first mold 10.
  • the first mold base 10 further includes a sealing element 19 which is formed of rubber and embedded into the groove 14.
  • the second mold base 20 can be combined with the first mold base 10 in an open mode or a close mode. In the mold 100 used in this embodiment, the first mold base 10 and the second mold base 20 are pivotally connected with each other.
  • the second mold base 20 includes a plurality of first plug holes 24 around the mold core 22.
  • the middle frame 30 includes a first mold plate 32 and a second mold plate 34.
  • the first mold plate 32 includes a first opening area 32a and the second mold plate 34 includes a second opening area 34a.
  • the first opening area 32a and the second opening area 34a together constitute the hollow part mentioned above.
  • the top surface of the first mold plate 32 around the first opening area 32a includes a recess defining a socket 32b. Inside the socket 32b are formed with a plurality of positioning posts 32c.
  • a plurality of second plug holes 32d are formed on the lower surface of the first mold plate 32 for inserting the first nails 16 of the first mold base 10.
  • the second mold plate 34 of the middle frame 30 includes a plurality of positioning holes 34b, and the top surface of the second mold plate 34 are formed with a plurality of second nails 34c.
  • An area of the second mold plate 34 is smaller than that of the first mold plate 32, and a thickness of the second mold plate 34 is substantially equal to that of the socket 32b.
  • the second mold plate 34 can be positioned in the socket 32b, and the top surface of the second mold plate 34 is substantially parallel to the top surface of the first mold plate 32.
  • the positioning posts 32c of the first mold plate 32 are inserted into the positioning holes 34b of the second mold plate 34 to fix the position of the second mold plate 34.
  • the second nails 34c of the second mold plate 34 mentioned above can be inserted into the first plug holes 24 of the second mold base 20.
  • the present invention provides a fixing mechanism for securing the second mold plate 34, which is positioned in the socket 32b, to the first mold plate 32.
  • the fixing mechanism includes at least one bolt 40, at least one first through hole 32e formed on the first mold plate 32, and at least one second through hole 34d formed on the second mold plate 34.
  • the fixing mechanism includes plural bolts 40, plural first through holes 32e and plural second through holes 34d, wherein the number of the bolts 40, the first through holes 32e and the second through holes 34d are the same.
  • the first through hole 32e is positioned horizontally with its two openings respectively communicating to the outside of the first mold plate 32 and the socket 32b.
  • the second through hole 34d can be also positioned horizontally.
  • the bolt 40 can be detachably inserted into the first through hole 32e and the second through hole 34d.
  • the second mold plate 34 cannot be detached from the first mold plate 32 when the bolt 40 is partially inserted into the first through hole 32e and partially inserted into the second through hole 34d.
  • the second mold plate 34 can be detached from the first mold plate 32 when the bolt 40 is removed from the second through hole 34d.
  • thermoplastic polyurethane TPU
  • TPU thermoplastic polyurethane
  • thermoplastic film 101 is positioned on the first mold base 10, and the first nails 16 penetrates through the first thermoplastic film 101. Then, the second plug holes 32d of the first mold plate 32 are aligned with the first nails 16 of the first mold base 10, and the first mold plate 32 can fit to the first mold base 10 by inserting the first nails 16 into the second plug holes 32d. Meanwhile, the first thermoplastic film 101 can be fixed between the first mold plate 32 and the first mold base 10 by the first mold plate 32 in a surface contact manner. The first thermoplastic film 101 is stretched to be positioned between the mold cavity 12 and the first opening area 32a, and the bottom surface of the first thermoplastic film 101 contacts with the sealing element 19.
  • a second thermoplastic film 102 is positioned between the second mold plate 34 and the second mold base 20. Then, by penetrating the second nails 34c through the second thermoplastic film 102 and inserting into the first plug holes 24, the second mold plate 34 fits to the second mold base 20. The second thermoplastic film 102 is also fixed between the second mold plate 34 and the second mold base 20 by the second mold plate 34 in a surface contact manner. Due to the flexibility and the stretching property of the second thermoplastic film 102, the second thermoplastic film 102 can tightly attach to the surface of the mold core 22 of the second mold base 20 when the mold core 22 of the second mold base 20 passes through the second opening area 34a of the second mold plate 34 even though the second thermoplastic film 102 is fixed by the second nails 34c.
  • the first thermoplastic film 101 positioned between the first mold base 10 and the first mold plate 32 is softened by heating. Then, by vacuum-pumping, the first thermoplastic film 101 can be attached to the inner wall of the mold cavity 12.
  • the first thermoplastic film 101 is heated by an outside heater.
  • the aforementioned outside heater includes an infrared heater, a heat gun or an electric heating element, but it is not limited thereto. The purpose is to pre-heat and soften the first thermoplastic film 101.
  • the vacuum-pumping process is performed after the pre-heating process.
  • the vacuum-pumping process includes steps of connecting the first mold base 10 with a vacuum-pumping machine via a pipe (not shown), turning on the vacuum-pumping machine, and drawing out the air between the first thermoplastic film 101 and the inner wall of the mold cavity 12 through the first vents 18. Then, the first thermoplastic film 101 attaches to the inner wall of the mold cavity 12.
  • a polyurethane mixture 103 is positioned on the first thermoplastic film 101, and the polyurethane mixture 103 is positioned inside the mold cavity 12.
  • the mold 100 is closed (as shown in FIG. 3 ).
  • the bolt 40 is inserted into the first through hole 32e and the second through hole 34d sequentially.
  • the polyurethane mixture 103 positioned therein reacts to form a shaped polyurethane foam, and the shaped polyurethane foam simultaneously combines with the first thermoplastic film 101 and the second thermoplastic film 102 during the reaction process.
  • the mold 100 is opened to make the second mold base 20 be opened corresponding to the first mold base 10.
  • the second mold plate 34 is secured to the first mold plate 32 via the bolt 40, and the first mold plate 32 fits to the first mold base 10, the second thermoplastic film 102 will not adhere to the second mold base 20. Then, the shaped product, i.e., the shaped polyurethane foam whose surface is covered with thermoplastic films is taken out. As shown in FIG. 5 , it is cross-sectional view of the shaped product. It is shown in the figure that an upper surface, a lower surface and side surfaces of the polyurethane foam 104 are completely covered by the first thermoplastic film 101 and the second thermoplastic film 102.
  • the sealing element 19 provides a sealed attachment to the first thermoplastic film 101 in the vacuum-pumping process, the vacuum-pumping effect is enhanced.
  • the thermoplastic film includes a predetermined thickness to make its upper and lower surfaces be tightly attached to the top surface of the first mold base 10 and the lower surface of the first mold plate 32 respectively, the sealing element 19 can be omitted.
  • the groove 14 formed on the first mold base 10 can also be omitted.
  • the inner wall of the mold cavity 12 can be selectively formed with concave-convex patterns to increase a decoration of the finished product.
  • One kind or plural kinds of patterns can be formed on a specific part of the inner wall depending on the requirement.
  • the outer surface of the thermoplastic films can be made to form corresponding patterns.
  • an inner surface of at least one of the first thermoplastic film and the second thermoplastic film is provided with a printed layer, and the printed layer is formed between the polyurethane foam and the thermoplastic film.
  • the middle frame 30 of the mold 100 is constituted by the first mold plate 32 and the second mold plate 34.
  • the first mold plate 32 and the second mold plate 34 are respectively used to fix each of the two thermoplastic films to the first mold base 10 and the second mold base 20. That is, one thermoplastic films is disposed between the first mold plate 32 and the first mold base 10, and the other thermoplastic films is disposed between the second mold plate 34 and the second mold base 20.
  • the mold can be equipped with the first mold base, the second mold base, and a single-piece middle frame.
  • the second mold base 20A shown in FIG. 7 are formed with plural second vents 26.
  • Each of the second vents 26 includes one end communicating with the outer surface of the mold core 22, and the other end communicating to the outside of the second mold base 20A.
  • the second mold base 20A is connected to a vacuum-pumping machine (not shown) via pipes, and the air therein can be drawn out through the second vents 26 by activating the vacuum-pumping machine.
  • the second mold base 20B shown in FIG. 8 includes plural nails 28.
  • Each of the nails 28 includes one end positioned inside the second mold base 20B, and the other end protruded from the surface of the mold core 22 and penetrates the second thermoplastic film 102.
  • the nails 28 can be formed to fix to the second mold base 20B, or can be formed with a moveable design such that the nails 28 are movably positioned inside the mold core 22.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP17179937.2A 2017-07-06 2017-07-06 Verfahren zur herstellung eines polyurethanschaums mit thermoplastischen folien Withdrawn EP3424695A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17179937.2A EP3424695A1 (de) 2017-07-06 2017-07-06 Verfahren zur herstellung eines polyurethanschaums mit thermoplastischen folien

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17179937.2A EP3424695A1 (de) 2017-07-06 2017-07-06 Verfahren zur herstellung eines polyurethanschaums mit thermoplastischen folien

Publications (1)

Publication Number Publication Date
EP3424695A1 true EP3424695A1 (de) 2019-01-09

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EP17179937.2A Withdrawn EP3424695A1 (de) 2017-07-06 2017-07-06 Verfahren zur herstellung eines polyurethanschaums mit thermoplastischen folien

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111605117A (zh) * 2019-12-23 2020-09-01 东莞市松裕塑胶皮具制品有限公司 一种二次压模成型e-tpu材质手机保护壳工艺
IT201900018407A1 (it) * 2019-10-10 2021-04-10 Pu Ro S R L Procedimento di stampaggio di una suola bistrato, stampo utilizzato e prodotto direttamente ottenuto.
EP3838575A1 (de) * 2019-12-20 2021-06-23 Engelbert Strauss GmbH & Co. KG Verfahren zum herstellen einer laufsohle sowie spritz- oder giesswerkzeug

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5352105A (en) * 1994-01-24 1994-10-04 Yang Kuo Nan EVA sole molding die assembly
US6475423B1 (en) * 1999-12-10 2002-11-05 Slipmate Company Hybrid injection molding process for enhancing exterior appearance of molded articles by molding fabric thereto
TW563624U (en) 2002-03-26 2003-11-21 Shuei-Mu Wang Structure with wear-resistant stereoscopic foamed objects
TW583919U (en) 2002-07-03 2004-04-11 Pou Chen Corp TPU protective device
US20070090575A1 (en) * 2005-10-26 2007-04-26 Fu-Chen Chen Method of polymerizing colored patterns inside a mode
US20090255625A1 (en) * 2008-04-14 2009-10-15 Polyworks, Incorporated Deep draw method of making impact and vibration absorbing articles and the articles formed thereby
TWM397168U (en) 2010-08-26 2011-02-01 Fabricoat Ind Corp Insoles and outsoles with thermoplastic side wall covering layer
US20120056345A1 (en) * 2009-05-14 2012-03-08 Lee Dong-Gun Polyurethane-coated spandex fabric-fused midsole and apparatus and method for manufacturing the same
KR20150026229A (ko) * 2013-09-02 2015-03-11 이상도 상면에 폴리우레탄코팅필름이 동시 융착된 미드솔 및 그의 제조방법

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5352105A (en) * 1994-01-24 1994-10-04 Yang Kuo Nan EVA sole molding die assembly
US6475423B1 (en) * 1999-12-10 2002-11-05 Slipmate Company Hybrid injection molding process for enhancing exterior appearance of molded articles by molding fabric thereto
TW563624U (en) 2002-03-26 2003-11-21 Shuei-Mu Wang Structure with wear-resistant stereoscopic foamed objects
TW583919U (en) 2002-07-03 2004-04-11 Pou Chen Corp TPU protective device
US20070090575A1 (en) * 2005-10-26 2007-04-26 Fu-Chen Chen Method of polymerizing colored patterns inside a mode
US20090255625A1 (en) * 2008-04-14 2009-10-15 Polyworks, Incorporated Deep draw method of making impact and vibration absorbing articles and the articles formed thereby
US20120056345A1 (en) * 2009-05-14 2012-03-08 Lee Dong-Gun Polyurethane-coated spandex fabric-fused midsole and apparatus and method for manufacturing the same
TWM397168U (en) 2010-08-26 2011-02-01 Fabricoat Ind Corp Insoles and outsoles with thermoplastic side wall covering layer
KR20150026229A (ko) * 2013-09-02 2015-03-11 이상도 상면에 폴리우레탄코팅필름이 동시 융착된 미드솔 및 그의 제조방법

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900018407A1 (it) * 2019-10-10 2021-04-10 Pu Ro S R L Procedimento di stampaggio di una suola bistrato, stampo utilizzato e prodotto direttamente ottenuto.
EP3838575A1 (de) * 2019-12-20 2021-06-23 Engelbert Strauss GmbH & Co. KG Verfahren zum herstellen einer laufsohle sowie spritz- oder giesswerkzeug
CN111605117A (zh) * 2019-12-23 2020-09-01 东莞市松裕塑胶皮具制品有限公司 一种二次压模成型e-tpu材质手机保护壳工艺

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